About one in six soldiers returning from the war in Iraq shows signs of post-traumatic stress disorder or other emotional difficulties, researchers are reporting today. Lower levels of psychiatric problems were found among troops who served in Afghanistan. The study, published today in The New England Journal of Medicine, is the first to examine the mental health of troops returning from Iraq. The researchers surveyed more than 6,000 soldiers in the months before and after service in Iraq or Afghanistan. Almost 17 percent of those who fought in Iraq reported symptoms of major depression, severe anxiety or post-traumatic stress disorder,...